minimum length for custom fields

[macetitan]

I made a custom field, and I need it to be minimum 15 characters, but it's only possible to set  the maximum length, that's really odd, no way to set a minimum length?

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anyone knows this?

[macetitan]

Still looking for a solution, maybe someones know?
The funny thing is that you can set a maximum lenght, but not a minimum lenght

[metulburr]

the regular expression field actually gives you unlimited customization.

/[0-9a-zA-Z]{6,}/

This checks for numbers or text of minimum length of 6 characters. You can pretty do much any string checking with regex. Including making sure the user inputs a specific base URL instead of spam for example.